package com.example.administrator.datepickdialog;

import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;
import android.view.View;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import android.widget.Button;
import android.widget.DatePicker;
import android.view.View.OnClickListener;
import android.app.DatePickerDialog;
import android.widget.Toast;

public class DatePickDialog extends Activity {

    private TextView showdate;
    private Button setdate;
    private int year;
    private int month;
    private int day;


    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_date_pick_dialog);

        showdate=(TextView) this.findViewById(R.id.showtime);
        setdate=(Button) this.findViewById(R.id.setdate);
        //初始化Calendar日历对象
        Calendar c=Calendar.getInstance(Locale.CHINA);
        Date mydate=new Date(); //获取当前日期Date对象
        c.setTime(mydate);////为Calendar对象设置时间为当前日期

        year=c.get(Calendar.YEAR); //获取Calendar对象中的年
        month=c.get(Calendar.MONTH);//获取Calendar对象中的月
        day=c.get(Calendar.DAY_OF_MONTH);//获取这个月的第几天
        showdate.setText("当前日期:"+year+"-"+(month+1)+"-"+day); //显示当前的年月日

        //添加单击事件--设置日期
        setdate.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v)
            {

                //创建DatePickerDialog对象
                DatePickerDialog my_datePickerDialog=new DatePickerDialog(DatePickDialog.this,Datelistener,year,month,day);
                my_datePickerDialog.show();//显示DatePickerDialog组件
            }
        });

    }
    //Toast toast=Toast.makeText(getApplicationContext(),"设置日期无效",Toast.LENGTH_SHORT);
    private DatePickerDialog.OnDateSetListener Datelistener=new DatePickerDialog.OnDateSetListener()
    {
        Calendar cd=Calendar.getInstance(Locale.CHINA);
        Date current_date=cd.getTime();
        @Override
        public void onDateSet(DatePicker v, int y, int m,int d) {

            Calendar da=Calendar.getInstance();
            da.set(y,m,d);
            Date date=da.getTime();

            if(date.getTime()<=current_date.getTime())
            {
                //修改year、month、day的变量值，以便以后单击按钮时，DatePickerDialog上显示上一次修改后的值
                year=y;
                month=m;
                day=d;
                //更新日期
                updateDate();
            }
            else {
                Toast toast=Toast.makeText(getApplicationContext(),"设置日期无效",Toast.LENGTH_SHORT);
                toast.show();
            }


        }
        //当DatePickerDialog关闭时，更新日期显示
        private void updateDate()
        {
            //在TextView上显示日期
            showdate.setText("当前日期："+year+"-"+(month+1)+"-"+day);
        }
    };


}
